Cutter attachment for hand punches



. April 23, 1946. L. P. MORIN I CUTTER ATTACHMENT FOR HAND PUNCHES Filed' Sept. 1, 1944 Patented Apr. 23, 1946 UNITED STATES PATENT OFFICE GUTTER ATTACHMENT FOR HAND PUNCHES Leo P. Morin, Port Arthur, Ontario, Canada Application September 1, 1944, Serial No. 552,365

1 Claim.

The present invention relates to new and useful improvements in cutters, and more particularly to a formerly conventional manually operable punch press arranged and adapted more especially for cutting holes in sheet metal and the invention has for its primary object to provide a cutter adapted for detachable engagementto the plunger of the press and which may be easily removed and replaced when desired.

A further object is to provide a device of this character of simple and practical construction,

which is eflicient and reliable in performance, relatively inexpensive to manufacture and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view showing the cutter in position on the plunger element and with parts broken away and shown in section.

Figure 2 is a similar view taken at right angles to Figure 1; and

Figure 3 is a top plan View of the bottom cutter.

Referring now to the drawing in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention, the numeral 5 designates the lower end of the plunger of a hand-operated press, the lower edge of the plunger being formed with a transverse slot 6 in its lower end adapted for receiving a corresponding transverse rib or lug l on the flanged head 8 of a stem 9 forming an extension for the plunger. The stem 9 is held in position at the lower end of the plunger 5 by means of a nut l0 threaded on the plunger and engaging the head 8 of the stem.

The lower end of the stem 9 is provided adjacent its lower end with reduced flattened shank side face portions I! and adapted for conformably seating in a socket 12 formed in a cutter member l3 which is secured on the reduced lower end of the stem by means of a set screw I4. Obviously, instead of providing the shank on the plunger stem 9 and the socket l2 in the cutter member [3, said shank and socket provision may be changed as to the parts 9 and 13, but the provision and arrangement shown is practical and the more preferable.

The cutter I3 is of rectangular shape in cross section and is beveled at its lower edge, as at [5,

to form a cutting edge for the cutter, said cutting edge being inclined downwardly toward one side of the cutter, as shown to advantage in Figure 2 of the drawing, whereby to form a substantially sharpened point I 6 at one corner of the cutter.

The cutter I3 cooperates with a stationary cutter I! secured to one side of a block l8 by means of a flange 19 at one side of the block and a retaining plate 20 secured to an opposite side of the block by means of a set screw 2|.

The block 18 is secured to the base plate 22 of the punch by means of a stud 23. The cutter I1 is likewise beveled at its upper edge, as shown at 24 in,Figure 1 of the drawing. It is, of course, understood that the stationary cutter l1 is'supported firmly in position and the movable cutter I3 is positioned for vertical reciprocation to take its cutting edge past yet in close contiguity to the cutting edge of said stationary cutter.

In the operation of the tool, the work is held by the hand of the operator on the stationary cutter ll and the hand lever for the press (not shown) is then pulled down to move the cutter l3 downwardly to cooperate with the cutter ll to cut through the work. The work is progressively moved during the cutting action to shear the size of cutdesired and the work is turned easily by hand in order to cut around the edges of an opening to complete the same or shear off a piece of sheet material by a straight continuous cutting thereof.

It is believed the details of construction, mannor of operation and advantages of the device will be readily understood from the foregoing without further detailed explanation.

Having thus described the invention what I claim is:

A cutting attachment for a hand operated punch press and comprising in combination, a movable cutter having a socket therein, a stem adapted for attaching to the lower end of the plunger of the punch press in place of a formerly provided detachable punch and having a reduced lower end portion inserted in said cutter socket, means, detachably securing the cutter on the reduced end portion of the stem, a stationary cutter, and means for securing the stationary cutter to the bed plate of the punch press in cooperating relation to the movable cutter, said last-named means comprising a supporting block adapted for attaching to said bed plate and having a flange at one side thereof for engaging one edge of the stationary cutter, and a retaining plate secured to a relative opposite side of the block for engaging an adjacent edge of the stationary cutter.

LEO P. MQRIN. 

